.touch-feedback {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.touch-feedback .circle {
    width: 0;
    height: 0;
    position: absolute;
    left: 0;
    top: 0;
    border-radius: 50%;
}